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Can't run scripts on gmail in chrome

I have created a chrome plugin but it is running on all google sites except gmail, how do I make it run on gmail?
My manifest file:
{
"manifest_version": 2,
"name": "drc",
"version": "0.1",
"background": {
"scripts": ["bg.js"]
},
"content_scripts": [
{
"matches": [
"<all_urls>"
],
"js": ["content.js", "onclic.js", "Jquery.js"],
"css": ["drpdwn.css"]
}
],
"browser_action": {
"default_title": "Append Test Text"
},
"permissions": [
"tabs",
"activeTab",
"https://mail.google.com/*",
"http://mail.google.com/* "
]
}
Error I get is, cannot read property 'parentNode' of null

Cannot read property 'onBeforeNavigate' of undefined (Chrome Extension)

I simpley want to get the extension fired if the action on 'onBeforeNavigate' happens. But for no reason the extension always trows this error:
Cannot read property 'onBeforeNavigate' of undefined
Error is on this line chrome.webNavigation.onBeforeNavigate.addListener(setProxy);
Here is my code so far:
popup.js
function setProxy(details){
console.log("Got fired!\n");
}
chrome.webNavigation.onBeforeNavigate.addListener(setProxy);
manifest.json
{
"manifest_version": 2,
"name": "Proxy Changer",
"description": "This extension Changes the Proxy settings every time you load a website",
"version": "1.0",
"browser_action": {
"default_icon": "icon.png"
},
"permissions": [
"activeTab",
"webRequest",
"notifications",
"debugger",
"background",
"management",
"https://ajax.googleapis.com/",
"<all_urls>",
"webRequestBlocking"
],
"background": {
"scripts": ["popup.js"],
"persistent": true,
"js": ["jQuery.js", "popup.js"]
}
}
I hate to say that I am very new to the Google Chrome Extension API but for me the Extension API is not working... I don't know what I am doing wrong..
I already watched to videos but still same error...
I would appreciate your help. Thank you and kind regards!

just add "webNavigation" permission to Manifest.json
{
"name": "My extension",
...
"permissions": [
"webNavigation"
],
...
}
see documentation
https://developer.chrome.com/docs/extensions/reference/webNavigation/#event-onCreatedNavigationTarget

Chrome extension Web Request doesn't show info

I was looking for without success.
I want to get the status of my requests from my extension but I can not get it.
Manifiest
{
"manifest_version": 2,
"name": "Pixel Checker TT",
"description": "This extension validate your pixels and its requests",
"version": "1.6",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"background": {
"persistent": true,
"scripts": ["popup.js"]
},
"content_scripts": [
{
"matches": [
"<all_urls>"
],
"js": ["sources/js/jquery-3.0.0.min.js","content.js"]
}
],
"permissions": [
"tabs",
"activeTab",
"webRequest",
"webRequestBlocking",
"*://*.mydomain.co/",
"*://*.myotherdomain.co/"
]
}
popup.js or background code
chrome.webRequest.onCompleted.addListener(function(details) {
for (var i = 0; i < details.requestHeaders.length; ++i) {
console.log(details.requestHeaders[i].url);
console.log(details.requestHeaders[i].statusCode);
}
},
{urls: ["<all_urls>"]},
['blocking','requestHeaders']);
The problem is that I dont have errors just aren not printed the info. I also tried to put the info in a div with $('#pixelsFound').text(details.requestHeaders[i].url)
but doesn't work too.

How to add user-script like tamparmonky on chrome extention

Hello i am trying to create a chrome extension. It like tampermonky. It add some user script. But the problem is some variable show undefined, But when i use the same script on tampermonky there is no error.
My extension manifest.json is
{
"name": "SayHello",
"description": "It will say hello when a page finishied load.",
"version": "0.4",
"permissions": [
"tabs",
"<all_urls>",
"storage"
],
"browser_action": {
"default_icon": "icon.png"
},
"options_page": "options.html",
"content_scripts": [
{
"exclude_globs":[],
"include_globs":["*"],
"matches": [
"http://www.amazon.com/*",
"https://www.amazon.com/*"
],
"js": ["email.js"],
"run_at": "document_end"
}
],
"converted_from_user_script": true,
"manifest_version":2
}
and email.js is.
P.when("jQuery","ready").execute(function(t){
var i="http://www.amazon.com/gp/profile/A3U7NCDBQ95EJM/customer_email";
t.get(i,function(t){
var o=t.data.email;
console.log('o:'+o);
});
return t;
});
error massage is Uncaught ReferenceError: P is not defined

How do you deal with Duplicate File names in Manifest.JSON for a chrome extension?

I am trying to implement a Github library within an extension. The file system has multiple files with the same names like "index.js" but when I look to reference these within the Manifest.json I feel like They will just throw errors
{
"manifest_version": 2,
"name": "log",
"description": "log",
"version": "1.0",
"browser_action": {
"default_icon": "favicon.png",
"default_popup": "popup.html"
},
"options_page": "options.html",
"background": {
"scripts": [ "eventPage.js", "background.js", "Gruntfile.js", "unittests.js", "crypto.js","index.js", "aes.js", "blowfish.js", "cast5.js","des.js","index.js","towfish.js", "index.js","md5.js","ripemd.js","sha.js", "armor.js", "basic.js", "index.js", "key.js", "keyring.js", "packet.js", "Signature.js", ]
},
"content_scripts": [
{
"matches": [ "<all_urls>" ],
"js": [ "Log.js" ]
}
],
"permissions" : [
"storage",
"notifications",
"contextMenus",
"http://*/*",
"https://*/*",
"tabs"
]
}
Can someone help me find documentation on how to handle file systems duplication within the Manifest.json?